Display device, driving method thereof, and electronic device including the same

Abstract

A display device includes a display unit including pixels, a power supply for generating a gamma power voltage, based on a power control signal, a gamma voltage generator for generating gamma voltages, based on a gamma control signal, and a data driver for generating a data voltage corresponding to a grayscale value included in image data, using the gamma voltages, and providing the data voltage to the pixels. A voltage level of the gamma power voltage varies according to a luminance of an input image corresponding to the image data.

What is claimed is: 
     
         1 . A display device comprising:
 a display unit including pixels;   a power supply configured to generate a gamma power voltage, based on a power control signal;   a gamma voltage generator configured to generate gamma voltages, based on a gamma control signal; and   a data driver configured to generate a data voltage corresponding to a grayscale value included in image data, using the gamma voltages, and provide the data voltage to the pixels,   wherein a voltage level of the gamma power voltage varies according to a luminance of an input image corresponding to the image data.   
     
     
         2 . The display device of  claim 1 , wherein the voltage level of the gamma power voltage becomes lower as the luminance of the input image becomes lower. 
     
     
         3 . The display device of  claim 1 , further comprising:
 a storage device configured to store black data voltage information and white data voltage information for each luminance of the input image; and   a timing controller configured to receive, from the storage device, the black data voltage information and the white data voltage information on the luminance of the input image to generate the power control signal and the gamma control signal.   
     
     
         4 . The display device of  claim 3 , wherein the power control signal includes the black data voltage information on the luminance and information on a margin value, and
 wherein the power supply determines the voltage level of the gamma power voltage by adding the margin value to a black data voltage level obtained from the black data voltage information on the luminance.   
     
     
         5 . The display device of  claim 4 , wherein the gamma power voltage is a voltage necessary for driving the data driver, and is supplied to the data driver via the gamma voltage generator. 
     
     
         6 . The display device of  claim 3 , wherein the gamma control signal includes the black data voltage information and the white data voltage information on the luminance,
 wherein the gamma voltage generator determines a black data voltage level obtained from the black data voltage information on the luminance as a voltage level of a first gamma voltage among the gamma voltages, and   wherein the gamma voltage generator determines a white data voltage level obtained from the white data voltage information on the luminance as a voltage level of a second gamma voltage among the gamma voltages.   
     
     
         7 . The display device of  claim 6 , wherein the first gamma voltage corresponds to a voltage having a highest voltage level among the gamma voltages, and
 the second gamma voltage corresponds to a voltage having a lowest voltage level among the gamma voltages, and   wherein the data voltage is selected among voltages generated by dividing the gamma voltages.   
     
     
         8 . The display device of  claim 3 , wherein the data driver receives, from the storage device, a lookup table including a selection value for calculating a data voltage corresponding to a specific grayscale value, and calculates a voltage level of the data voltage, using the selection value, and
 wherein, irrespective of variations in the luminance of the input image, the selection value for calculating the data voltage corresponding to a same grayscale value remains unchanged.   
     
     
         9 . The display device of  claim 8 , wherein the data voltage becomes a black data voltage when the selection value is 0, and becomes a white data voltage when the selection value is 1. 
     
     
         10 . The display device of  claim 8 , wherein the data voltage becomes a black data voltage when the selection value is 1, and becomes a white data voltage when the selection value is 0. 
     
     
         11 . A method of driving a display device, the method comprising:
 receiving, from a timing controller, black data voltage information and white data voltage information on a luminance of an input image;   receiving a lookup table from the timing controller that includes selection values mapped to corresponding grayscales; and   calculating a data voltage level, based on the received black data voltage information, the received white data voltage information, and a selection value among the selection values mapped to one of the grayscales of the input image,   wherein irrespective of variations in the luminance of the input image, the selection value corresponding to a same grayscale value remains unchanged.   
     
     
         12 . The method of  claim 11 , wherein a data voltage generated from the data voltage level becomes a black data voltage when the selection value is 0, and becomes a white data voltage when the selection value is 1. 
     
     
         13 . The method of  claim 11 , wherein a data voltage generated from the data voltage level becomes a black data voltage when the selection value is 1, and becomes a white data voltage when the selection value is 0. 
     
     
         14 . The method of  claim 11 , wherein the display device includes a storage device configured to store black data voltage information and white data voltage information for each luminance of the input image, and the lookup table, and
 wherein the method further comprises receiving, by the timing controller, the black data voltage information and the white data voltage information on the luminance of the input image, and the lookup table from the storage device.   
     
     
         15 . The method of  claim 11 , wherein the display device includes a power supply configured to generate a gamma power voltage, based on a power control signal generated by the timing controller, and
 wherein a voltage level of the gamma power voltage varies according to the luminance of the input image.   
     
     
         16 . The method of  claim 15 , wherein the voltage level of the gamma power voltage becomes lower as the luminance of the input image becomes lower. 
     
     
         17 . An electronic device, comprising:
 a processor to provide input image data; and   a display device to display an image based on the input image data,   the display device comprising:   a display unit including pixels;   a timing controller; and   a data driver configured to:
 receive black data voltage information and white data voltage information corresponding to a luminance of an input image, 
 receive a lookup table from the timing controller including selection values corresponding to respective grayscales; and 
 calculate a data voltage level based on the received black data voltage information, the received white data voltage information, and a selection value from the lookup table corresponding to a grayscale in the input image. 
   
     
     
         18 . The electronic device of  claim 17 , wherein the data driver calculates a data voltage based on the data voltage level and applies the data voltage to a data line connected to the pixels. 
     
     
         19 . The electronic device of  claim 17 , wherein the data voltage level is V black +GLUT×(V white −V black ), where V black  is a black data voltage derived from the received black data voltage information, V white  is a white data voltage device from the received white data voltage information and GLUT is the selection value. 
     
     
         20 . The electronic device of  claim 17 , wherein the data voltage level is V white +GLUT×(V black −V white ), where V black  is a black data voltage derived from the received black data voltage information, V white  is a white data voltage device from the received white data voltage information and GLUT is the selection value.